Apple Syrup

This is a family favorite of my niece's husband's family when he was growing up.

Stir together in a small saucepan:
1 cup granulated sugar
2 tablespoons cornstarch
1/2 teaspoon cinnamon

Add:
2 cups apple juice
1 tablespoon lemon juice
Stir and cook until thickened. Bring to a boil, turn heat down and cook for 1 minute. Remove from the heat and add 1/4 cup butter.